Abstract

We inscribe with 266 nm femtosecond pulses a $\sim 0.75\%$ output coupler for a 1550 nm fiber laser directly through the coating of an SMF-28. The output coupler was inscribed with the phase-mask technique without ${\mathrm{H}}_2$ loading. This output coupler was spliced to an active Er/Yb fiber, and a fiber laser with an output power of $\sim 6.4\mathrm{W}$ and a slope efficiency of $\sim 30\%$ was obtained. To the best of our knowledge, this is the first reported attempt to inscribe a fiber Bragg grating through the polymer jacket of an optical fiber with a UV femtosecond laser.

© 2018 Optical Society of America

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